The invention relates to the technical field of food processing, and discloses a method for delaying quality deterioration in a raw sugar storage process. The method for delaying the quality deterioration in the raw sugar storage process comprises a step of adding a metal oxide and/or a metal hydroxide into raw sugar to make the pH value of the mixed raw sugar to be 6.8 to 8.5, wherein the metal is a metal element from Group IA or Group IIA. The method provided by the invention can adjust the pH value of the raw sugar simply and conveniently, and can significantly delay the quality deterioration in the raw sugar storage process without adding a procedure.